Modifier Driver Fields
This article explains Modifier Driver fields in Model Reef.
You will learn:
What modifier drivers are.
When to use them instead of variables.
How to apply them as multipliers or growth rates.
Modifier drivers do not represent standalone economic quantities. They are adjustment series used to shape other drivers and variables.
Key fields for modifier drivers
When editing a modifier driver you will see fields such as:
Name For example
Growth - Revenue,Uplift - Promo,Index - Seasonality.Type Set to Modifier driver.
Units Often percentages, indices or unitless multipliers.
Time series grid Values per period representing the adjustment factor.
Notes and tags To document what the modifier does and where it is used.
How modifier drivers are applied
In formulas, modifier drivers are used as scalars, for example:
Adjusted revenue = Base revenue × Modifier driverCost = Base cost × (1 + Inflation driver)Scenario B value = Base scenario value × Scenario modifier driver
They do not create P&L, Balance Sheet or Cashflow entries by themselves.
Scenario and branch specific modifiers
You can define modifier drivers that:
Apply to the entire model in a scenario (for example a scenario wide discount factor).
Apply only to a subset of variables via formulas.
Are used to simulate shocks, discounts, price changes and other sensitivities.
Because each scenario is its own model, you can maintain different modifier profiles per scenario.
When to use a modifier driver instead of a variable
Use a modifier driver when:
You want to tweak existing variable logic without duplicating variables.
You need a reusable scalar series applied in many places.
You want to centralise scenario specific multipliers for easy tuning.
Use a variable when the series itself should appear as a line item in financial statements.
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